NYC-WTC_000234815

NYC 9/11 Public Portal Document

DRAFT

Personal air monitoring

Agency Date Location (see Activity N N above Maximum Comment notes on page samples TWA (fibers per 3) OSHA cc) PEE* ConEd 9/21/01- Inside Splicing 7 0 0.026 f/cc Max value was taken at Rector and 9/23/01 Controlled PCM Washington. No TEM given. Zone Unknown Walking All were less than detection limit; highest detection limit was <0.011 by PCM method___________________ Inside No Stated 8 0 0.02 f/cc Max value was taken at Rector and Controlled Activity PCM Washington. No TEM given. Zone US Public 9/19/01 Inside Unknown 7 9 0.2777 by Eocation is ‘ground zero.’ Result Health Controlled TEM needs to be verified with PHS b/c Service Zone PCM result was only 0.046f/cc. 9/18/01- Fresh Kills Unknown 21 7 0.175 by (No analysis done by TEM for this 9/19/01 Eandfill PCM location.) Union of 9/21/01 Unknown Operating 2 0 0.0373 by Operating location engineers TEM Engineers

*0.1 fibers per cc by PCM method; US-OSHA permissible exposure limit for 8 hour time weighted average.

o Interpretation: Dusty work in control zone continues to have the potential to generate elevated levels of asbestos fibers. Continued use of H appropriate respiratory protection for workers in or near potentially dusty locations or tasks is indicated. Dust suppression measures should be enhanced. Additional personal monitoring underway. S o I—i o o I o o o Draft: 9/25/01, 8:22 PM \EnvironmentaMonitoringUpdate_9_25 ND Page: 4 of 6 kO kO kO

NYC-WTC_000234818